The default grid system provided in Bootstrap utilizes 12 columns that render out at widths of 724px, 940px (default without responsive CSS included), and 1170px. Below 767px viewports, the columns become fluid and stack vertically.
<div class="row">
<div class="span4">...</div>
<div class="span8">...</div>
</div>
As shown here, a basic layout can be created with two "columns", each spanning a number of the 12 foundational columns we defined as part of our grid system.
<div class="row">
<div class="span4">...</div>
<div class="span4 offset4">...</div>
</div>
With the static (non-fluid) grid system in Bootstrap, nesting is easy. To nest your content, just add a new .row and set of .span* columns within an existing .span* column.
.span3 columns should be placed within a .span6.
<div class="row">
<div class="span6">
Level 1 column
<div class="row">
<div class="span3">Level 2</div>
<div class="span3">Level 2</div>
</div>
</div>
</div>
The fluid grid system uses percents for column widths instead of fixed pixels. It also has the same responsive variations as our fixed grid system, ensuring proper proportions for key screen resolutions and devices.
1.好多公司都希望让公司的员工感到幸福，因为管理者认为，这样员工会更爱工作。 温城辉不仅自己读书，也要求团队成员读。
<div class="row-fluid">
<div class="span4">...</div>
<div class="span8">...</div>
</div>
Nesting with fluid grids is a bit different: the number of nested columns doesn't need to match the parent. Instead, your columns are reset at each level because each row takes up 100% of the parent column.
<div class="row-fluid">
<div class="span12">
Level 1 of column
<div class="row-fluid">
<div class="span6">Level 2</div>
<div class="span6">Level 2</div>
</div>
</div>
</div>
The default and simple 940px-wide, centered layout for just about any website or page provided by a single <div class="container">.
<body>
<div class="container">
...
</div>
</body>
<div class="container-fluid"> gives flexible page structure, min- and max-widths, and a left-hand sidebar. It's great for apps and docs.
<div class="container-fluid">
<div class="row-fluid">
<div class="span2">
<!--Sidebar content-->
</div>
<div class="span10">
<!--Body content-->
</div>
</div>
</div>
Media queries allow for custom CSS based on a number of conditions—ratios, widths, display type, etc—but usually focuses around min-width and max-width.
广泛配对广告系列，将所有关键字重新添加完全匹配的否定关键字，这会强制广泛匹配以识别新的/同义词/相关搜索组合。”在Dwango创始人川上量生看来，尽管人们已经拥有社交网络来帮助自己在虚拟世界构建个人关系，但是niconico想要提供的是“网络上近似于街角一隅的场景”。
杨国强灵机一动，决定建一个教育储备金“想读书，先交30万储备金，读完书全额退还”。 这些连锁效应带动了亚文化的繁荣，niconico也自然成为了世界最早的二次元亚文化相关视频的发源地。
| Label | Layout width | Column width | Gutter width |
|---|---|---|---|
| Smartphones | 480px and below | Fluid columns, no fixed widths | |
| Smartphones to tablets | 767px and below | Fluid columns, no fixed widths | |
| Portrait tablets | 768px and above | 42px | 20px |
| Default | 980px and up | 60px | 20px |
| Large display | 1200px and up | 70px | 30px |
2015年底，24季私享家获得由阿里巴巴和华媒控股领投的2500万天使轮融资。
<meta name="viewport" content="width=device-width, initial-scale=1.0">
Bootstrap doesn't automatically include these media queries, but understanding and adding them is very easy and requires minimal setup. You have a few options for including the responsive features of Bootstrap:
Why not just include it? Truth be told, not everything needs to be responsive. Instead of encouraging developers to remove this feature, we figure it best to enable it.
/* Landscape phones and down */
@media (max-width: 480px) { ... }
/* Landscape phone to portrait tablet */
@media (max-width: 767px) { ... }
/* Portrait tablet to landscape and desktop */
@media (min-width: 768px) and (max-width: 979px) { ... }
/* Large desktop */
@media (min-width: 1200px) { ... }
For faster mobile-friendly development, use these basic utility classes for showing and hiding content by device.
这个感觉让毕胜很紧张，他和团队到市场上做调研，最后得出的结论是“中国玩具市场只有一百多亿，涉及到互联网上又是很小的范围，乐淘又是很小中的一部分，虽然毛利率足够大，但没有办法产生规模化效益。他在安徽和江苏的交界处和县建了600套度假别墅，并现场请来了汤唯助阵，结果合肥的、南京的有钱人蜂拥而至，现场足足有3000人，分分钟打破南京度假别墅的销售记录。
也就是说，在2017年，只有头部、腰部和垂直大号，才可能看到希望，否则很可能回到原点，或者沦为炮灰。 03 中国成功的互联网创业者，大体上有两种，一种是草莽型，善断，判断大势，笼络人心，一种是学霸型，善谋，计算布局，带队攻坚。
熊俊总结福建互联网创业者的特点是：草根。 不过，关于海外扩张战略本身，摩拜单车创始人胡玮炜出言谨慎。
| Class | Phones 480px and below | Tablets 767px and below | Desktops 768px and above |
|---|---|---|---|
.visible-phone |
Visible | Hidden | Hidden |
.visible-tablet |
Hidden | Visible | Hidden |
.visible-desktop |
Hidden | Hidden | Visible |
.hidden-phone |
Hidden | Visible | Visible |
.hidden-tablet |
Visible | Hidden | Visible |
.hidden-desktop |
Visible | Visible | Hidden |